up vote 1 down vote favorite

I am trying to fetch parent categories and subcategories from same table. I'm using php rest api for the same.

This is my table. 

id  parent  category
--------------------
1   | 0 |   Fruits
2   | 0 |   Cars
3   | 1 |   Orange
4   | 1 |   Apple
5   | 0 |   Books
6   | 2 |   Benz
7   | 5 |   Comics
8   | 2 |   Honda
9   | 5 |   Fantasy

How could I get the following json with php/mysql query.

{
    "categories": [{
            "id": "1",
            "category": "Fruits",
            "subCat": [{
                "id": "3",
                "category": "Orange"
            }, {
                "id": "4",
                "category": "Apple"
            }]
        }, {
            "id": "2",
            "category": "Cars",
            "subCat": [{
                "id": "6",
                "category": "Benz"
            }, {
                "id": "8",
                "category": "Honda"
            }]

        }, {
            "id": "5",
            "category": "Books",
            "subCat": [{
                "id": "7",
                "category": "Comics"
            }, {
                "id": "9",
                "category": "Fantasy"
            }]

        }

    ]
}

Thanks for any help.

share|improve this question
up vote 2 down vote accepted

I think this will solve your issue

    function buildTree(array $elements, $parentId = 0)  {
    $branch = array();
    foreach($elements as $element)
        {
        if ($element['parent'] == $parentId)
            {
            $children = buildTree($elements, $element['id']);
            if ($children)
                {
                $element['subCat'] = $children;
                }

            $branch[] = $element;
            }
        }

    return $branch;
    }

$query1 = mysql_query("select * from table");

while ($rlt2 = mysql_fetch_array($query1, MYSQL_ASSOC))
    {
    $child[] = $rlt2;
    }

$tree['categories'] = buildTree($child);
$this->response($this->json($tree) , 200);
share|improve this answer
up vote 1 down vote

Approximately like this - but it's not quite right (I'm hopelessly bad at transforming arrays, so I'll leave it for someone else to tweak that bit)...

<?php

require('path/to/connection/stateme.nts');

$query = "
SELECT x.id
     , x.category
     , y.id sub_id
     , y.category sub_category
  FROM my_table x
  LEFT
  JOIN my_table y
    ON y.parent = x.id
 WHERE x.parent IS NULL
 ORDER
    BY id,sub_id;
";

$result = mysqli_query($db,$query);

$my_array = array();

while($row = mysqli_fetch_assoc($result)){
$my_array[] = $row;
}

$new_array=array();

foreach($my_array as $row){
    $new_array[$row['id']][$row['category']][] = $row['id']['category'];
    };  //this bit needs fixing

$json = json_encode($new_array);
?>
share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.